Universal drive for grinding machines and the like



NOV. 22, 1932. I ET AL 1,888,480

UNIVERSAL DRIVE FOR GRINDING MACHINES AND THE LIKE Filed Feb. 18, 1931 5Sheets-Sheet l Nov. 22, 1932. M ET AL 1,888,480

UNIVERSAL DRIVE FOR GRINDING MACHINES AND THE LIKE Filed Feb. 18. 1931 sSheets-Sheet 2 IFJJII Nov. 22, 1932. A. STORM ET AL 1,888,488

UNIVERSAL DRIVE FOR GRINDING MACHINES AND THE LIKE Filed Feb. 18. 1931 aSheetsSheet 5 Patented Nov. 22, 1932 UNITED STATES PATENT OFFICE ADOLPHSTORM AND THOR THORSEN, OF MINNEAPOLIS, MINNESOTA, ASSIGNORS TO STORMMANUFACTURING 00., INC., OF MINNEAPOLIS, LIINNESOTA, A CORPORATION OFMINNESOTA UNIVERSAL DRIVE FOR GRINDING MACHINES AND THE LIKE Applicationfiled February 18, 1931. Serial No.-51 6,653.

Our present invention relates to grinding machines and the like and hasfor its object the provision of a highly efiicient universal drive forthe grinding or other cutting wheel thereof, together with a novelsupport for said machine.

The invention, in part, is a division of our pending United Statesapplication for patent for piston turning and grinding machine, filedMarch 21st, 1930, under Serial Number 437,741. 7 I

Generally stated, the invention consists of the novel devices andcombinations of devices hereinafter described and defined in the claims.

In the accompanying drawings; which illustrate the invention, likecharacters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1- is a rear perspective view of a piston turning and grindingmachine in which the invention is embodied; I

Fig. 2 is a bottom plan view of the base;

Fig. 3 is a rear elevation of the universal drive, some parts beingremoved, and fraga mentarily illustrating the base on which said driveis mounted;

Fig. 4 is an elevation of the parts shown in Fig. 3; i

Fig. 5 is a fragmentary perspective view of the upper end portion of therocker arm;

Fig. 6 is a fragmentary view, partly in elevation and partly inhorizontal section, taken substantially on the line 66 of Fig. 1, on anenlarged scale;

Fig. 7 is a view principally in plan with some parts sectioned on theline 77 of Fig. 6; and

Fig. 8 is a fragmentary detailview, partly in elevation and partly insection, taken on the line 88 of Fig. 6, on an enlarged scale.

The invention, as shown, is embodied in a piston turning and grindingmachine of the type disclosed and fully described and claimed inthe'application heretofore identified. Of the parts of thismachine, itis important to note the base 9, bed 10, headstock 11, tailstock 12,carriage 13 mounted for reciprocatory movement on a pair of ways 14,which extend parallel to the axes of said headstock and tailstock, and across slide 15 mounted on the carriage 13 for rec'iprocatory movementtransversally of said axes. The manually operated feed for the crossslide 15 is indicated as an entirety by the numeral 16. The base 9 has anovel support as will presently appear. v c

A semifinished piston X is held by the centers of the headstock 11 andtailstock 12. On the front end of the cross slide 15 is a tool rest 17in which is mounted a cutting tool 18. Mounted on the rear end portionof the cross slide 15 is a grinder head 19, secured for bodilyadjustment toward or from the tool holder)1( by a clamping connection 20(see Fig. 6

An emery, or other cutting wheel 21, is mounted on the left hand end ofa spindle 22, which extends parallel to the axes of the headstock 11 andtailstock 12 and is journaled in a pair of axially spaced bearings 23 onthe grinder head 19. A relatively small pulley 24 is keyed to thespindle 22 between the bearings 23 (see Fig. 7), which is driven at ahigh rate of speed as willpresently appear.

By reference to Fig. 1 it will be noted that the cutting tool 18 isforward of the piston X, and the grinding wheel 21 is rearward thereofand spaced so that said cutting tools may be alternately brought intoaction on the piston at opposite sides thereof by reciproeating thecross slid-e 15. r

The mounting of the base 9, heretofore referred to, includes three flatfeet 25 on the under side of said base for three point contact with thefloor. Two of these feet 25 are at the front corners of the base 9, andthe other is at the back thereof. The two front feet 25 are on a linethat is parallel to the axes of the headstock 11 and tailstock 12, andsaid back foot is midway between the twofront feet 25.

The universal drive includes an electric motor 26, mounted in a cradle27, with the axis of its rotor shaft 28 at right angles to the axis ofthe spindle 22. Said cradle 27 is pivoted at its endsto the ends of aU-shaped cradle support 29, and supports the motor 26 for rockingmovement about a horizontal axis thereto by slot and bolt connections40.

parallel to the direction of the travel of the carriage 13. This cradlesupport 29, in turn, is secured by a horizontal pivot pin to a bearingbracket 31 for rocking movement in the direction of the travel of thecross slide 15, and carries with it the cradle 27 and motor 26. Thebearing bracket 31 is bolted to the base 29 directly over andsubstantially on the rear foot 25, so that the same is very close to thefloor and a relatively long distance from the iston X.

T e grinding wheel 21 is driven from the motor 26 by a belt 32 whichruns over a pulley 33 on the rear end of the rotor shaft 28 and thepulley 24. This belt 32, at its intermediate ortion, also runs over apair of idle guide pu eys 34, which changes its direction of the travelso that the upper section of said belt extends substantiallyhorizontally over the machine, and the lower section thereof issubstantially vertical at the rear of the machine. These guide ulleys 34also produce a fourth twist in said ower section of the belt.

The e pulleys 34 are 'ournaled, the one above t other, in pairs 0bearings 35 on a pair of posts 86, formed with the upper end of'a heavupright rocker arm 37. It will be noted that one of the bearings 35 ofeach pair issecured to one of the posts 36 by a horizontal: ivot, andthe other of said bearings is secure to the other of said posts by aslot and bolt connection 38. This mounting of the bearings 35 permitsvertical angular adjustments of the guide pulleys 34 in respect to eachother and transversally of the rotor shaft 28.

It will be further noted by reference to Fig. 5 that the left hand post36 is inwardly ofiset for the ad'ustable bearing 35 of the upper guidepul y 34, and that the right hand post 36 1S inwardly offset for thepivot bearing of the lower guide pulley 34. These ofiset portions in theposts 36 hold the guide pulleys 34 horizontally angular in respect toeach other. The above adjustments of the 'de pulleys 34 are important tocause the t 32 to run over the pulleys 24 and 34 in pro r relationthereto.

ormed with the lower end of the rocker arm 37 is a yoke which straddlesthe motor 36 transversally of its rotor shaft 28 and the pro thereof arepivoted at 39 to the cradle 27. id prongs are further secured to thecradle 27 to rigidly connect the rocker arm 37 The connections 40 permitangular adjustment of the rocker arm 37 on the cradle 27 toward or fromthe machine. The purpose for thus adjustabl mounting the rocker arm 37on the cradle 7 is to permit adjustment of the guide pulleys 34 over thepulley 33 for holding the sections of the belt 32 where they cross eachother in proper relation to each other.

A link 41 connects the rocker arm 37 to the cross slide 15 and holdssaid rocker arm with theguide pulleys 34 a predetermined and constantdistance from the pulley 24 so that the relation of the belt 32 to itspulleys is always the same. This link 41 extends longitudinally betweenthe runs of the horizontal section of the belt 32, and on the front andrear ends thereof are yokes 42 and 43, respectively. Said yoke 42 isconnected to the link 41 by screw threads and a lock nut 44, and itsprongs straddle the lower run of the belt 32 and are connected byhorizontal pivots 45 to the grinder head 19. Obviously, by turning theyoke 42 about the axis of the link 41 the same may be longitudinallyadjusted thereon to vary the operative length of said link, at will, andcause the same to act as a tightener for the belt 32. I

The rear yoke 43 is connected to the rocker arm 37 by a horizontal pivot46 and to the link 41 by a flexible joint 47 which permits said yoke toturn about the longitudinal axis of the link 41 and move angularly inrespect thereto. This joint 47 includes an anti-friction thrust bearing48 and a compressed coil spring 49 which yield ngly holds the rocker arm37 link 41, and thrust bearing 48 in assembled relation. The link 41 isknurled to facilitate the turning thereof in the front yoke 42.

During the traverse of the carriage 13, the link 41 moves the rocker armarallel to the longitudinal axis of the wor to-wit: the piston X; andduring the traverse of the slide 15, the link 41 moves the rocker arm 37transversally of the longitudinal axis of said work. 7

Referring again to the three point support for the base 9, to-wit: thefeet 25 and the mounting of the universal drive, the object thereof isto afford a firm support for the base 9, irrespective of any unevennessin the floor, and thereby prevent strains on said base that would tendto twist or throw the centers of the headstock 11 and tailstock 12 outof true axial alignment.

It is highly important to note that the support for the universal driveis directly over the rear foot 25 and close to the floor so thatvibrations from said drive are transmitted to the floor rather thanthrough the machine and universal drive to the work and centers.

From the foregoing it must be evident that the invent on hereindisclosed is capable of lar e range of modification within the spiritoft e invention herein disclosed and claimed.

What we claim is:

1. In a machine of the class described, a headstock and a tailstock, areciprocatory carriage between the headstock and the tailstock, a crossslide on'the carriage, a grinding wheel on the cross slide, a motormounted for universal movement, and a universal drive from the motor tothe grinding wheel.

2. In a machine of the class described, a headstock and a tailstock, areciprocatory carriage between the headstock and the tailstock, a crossslide on the carriage, a grinder head mounted on the cross slide foradjust; ment longitudinally thereof, a grinding Wheel mounted on thegrinder head, a motor mounted for universal movement, and a universaldrive from the motor to the grinding Wheel.

3. In a machine of the class described, a reciprocatory carriage, across slide on the carriage, a grinding Wheel on the cross slide, acradle support mounted to rock in the direction of the travel of thecross slide, a

cradle mounted on the cradle support to rock in the direction of thetravel of the carriage, a motor in the cradle, means actuated by thecross slide for rocking the cradle, and driving connections from themotor to the'grinding Wheel.

4. In a machine of the class described, a reciprocatory carriage, across slide on the carriage, a grinding Wheel on the cross slide, acradle support mounted to rock in the direction of the travel of thecross slide, a era dle mounted on the cradle support to rock in thedirection of the travel of the carriage, a motor in the cradle, a fixedrocker arm on the cradle, a connection from the cross slide to the rockr arm, and driving connections from. the motor to the grinding Wheelcarried in part by the rocker arm.

5. In a machine of the class described, a reciprocatory carriage, across slide on the carriage, a grinding Wheel on the cross slide, acradle support mounted to rock in the direction of the travel of thecross slide, a cradle mounted on the cradle support to rock in thedirection of the travel of the carriage, a fixed rocker arm on thecradle, a link connecting the rocker arm to the cross slide, a motor inthe cradle, and driving connections from the motor to the grinding wheelinclud ing a belt and guide pulleys therefor on the rocker arm.

6. The structure defined in claim 5 in which the operative length of thelink may be varied, at will, to tension the belt.

7 The structure defined in claim 5 in which the rocker arm is angularlyadjustable in respect to the cradle and in the direction of the travelof the cross slide.

8. In a machine of the class described, a reciprocatory carriage, across slide on the carriage, a grinding Wheel on the cross slide, amotor mounted for compound rocking movements in the direction of thetravel. of the carriage and in the direction of the travel of the crossslide, and driving connections from the motor to the grinding Wheel.

9. In a machine of the class described, a reciprocatory carriage, across slide on the carriage, a grinding Wheel on the cross slide, amotor mounted for compound rocking movements in the direction of thetravel of the carriage and in the direction of the travel of the crossslide, a rocker arm fixed in respect to the motor and connected to thecross slide to impart rocking movements to the and the direction of thetravel of the cross slide, the rotor shaft of the motor beingsubstantially at right angles to the shaft of the grinding wheel, apulley on the rotor shaft, a rocker arm fixed in respect to the motorand operated from the cross slide to impart the rocking movements to themotor, guide pulleys on the rocker arm, and a belt arranged to run oversaid pulleys.

11. The structure defined in claim 10 in which the axes of the guidepulleys are sub stantially parallel to the axis of the shaft of thegrinding Wheel.

The structure defined in claim 10 in which the axes of the guide pulleysare substantially parallel to the axis of the shaft of the grindingWheel and spaced longitudinally of the rocker arm.

18. The structure defined in claim 10 in which the rocker arm isangularly adjustable longitudinally of said rotor shaft.

14. In a machine of the class described, a reciprocatory carriage, across slide on the carriage, a grinding Wheel having a pulleyequippedshaft journaled on the cross slide and extending t-ransversally thereof,a motor mounted for compound rocking movements in the direction of thetravel of the carriage and the direction of the travel of the crossslide, the rotor shaft of the motor being substantially at right anglesto the shaft of the grinding Wheel, a pulley on the rotor shaft, 7

' an upright rockerarm fixed in respect to the motor, a. link connectingthe rocker arm to the cross'slide, a pair of guide pulleys on the rockerarm spaced one above the link and the other below the same, and a beltarranged to run over said pulleys with the link extending longitudinallytherebetween.

15. In a machine of the class described, a

reciprocatory carriage, a cross slide on the carriage, a grinding Wheelon the cross slide,

a motor mounted for compound rocking movements in the direction of thetravel of the carriage and in the direction of the travel of the crossslide, a rocker arm fixed in respect to the motor, a link having aswiveled joint connecting the rocker arm to the cross slide,

and driving connections from the motor to the grinding Wheel.

16. In a machine of the class described, a base, a bed on the base, aheadstock and a tailstock on the bed, a reciprocatory carriage on thebed between the headstock and the tailstock, across slide on thecarriage, a grinding wheel on the cross slide, said base having threelow supporting feet, a motor 5 mounted on the base directly over one ofsaid feet for universal movement, and a uni versal drive from the motorto the grinding wheel.

17. In a machine of the class described, a base, a bed on the base, aheadstock and a tailstock on the bed, a reciprocatory carriage on thebed between the headstock and the tailstock, a cross slide on thecarriage, a grinding wheel on the cross slide, a motor mounted on thebase rearward of the cross slide for universal movement and a universaldrive from the motor to the grinding wheel; said base having three lowsupporting'feet, one of which is under the motor. 18. In a machine ofthe class described, a base, a bed on the base, a headstock and atailstock on the bed, a reciprocatory carriage on the bed, a cross slideon the carriage, a grinding wheel on the cross slide, a motor 28 mountedon the base at the back thereof for universal movement, a universaldrive from tlie motor to the grinding wheel, said base having three lowsupporting feet, one of which is under the motor, and the other two 30of which are at the front of the base, and in a line substantiallyparallel to the axes of the headstock and the tailstock.

19. In a machine of the class described, a reciprocatory carriage, across slide on the 36 carriage, a grinding wheel on the cross slide, amotor mounted for compound rocking movements in the direction of thetravel of the carriage and in the direction of the travel of the crossslide, a rocker arm fixed in respect 40 to the motor, a link having auniversal joint connecting the rocker arm to the cross slide, anddriving connections from the motor to the grinding wheel.

The structure defined in claim 10, in which the guide pulleys areangularly adjustable transversally of the axis of the rotor shaft, andin respect to each other.

In testimony whereof we aflix our signatures. ADOLPH STORM. THORTHORSEN.

